/Engine/Source/Runtime/CoreUObject/Public/UObject/Package.h
Save a list of packages concurrently using Save2 mechanism SaveConcurrent is currently experimental and shouldn't be used until it can safely replace Save.
static ESavePackageResult SaveConcurrent ( [TArrayView](API\Runtime\Core\Containers\TArrayView)< [FPackageSaveInfo](API\Runtime\CoreUObject\UObject\FPackageSaveInfo) > InPackages, const [FSavePackageArgs](API\Runtime\CoreUObject\UObject\FSavePackageArgs) & SaveArgs, [TArray](API\Runtime\Core\Containers\TArray)< [FSavePackageResultStruct](API\Runtime\CoreUObject\UObject\FSavePackageResultStruct) > & OutResults )